- What is the active ingredient in Preen® Extended Control™ Weed Preventer?
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There are two:
1.500% Trifluralin
0.375% Isoxaben
- What are the other ingredients in Preen® Extended Control Weed Preventer?
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In addition to the active ingredient, Preen® Extended Control Weed Preventer contains a biodegradable carrier agent made of corn cob and/or biodac (recycled newsprint).
- What weed seeds does Preen® Extended Control Weed Preventer prevent from germinating?
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See the product label for a list of grassy and broadleaf weeds controlled.
- How long does Preen® Extended Control Weed Preventer prevent weed seeds from germinating?
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Up to 6 months per application. Heavy rain or excessive heat and humidity weather conditions may shorten the effective period.
- How long does Preen® Extended Control Weed Preventer stay in the soil?
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Approximately 6 months per application. The rate at which Preen® Extended Control Weed Preventer biodegrades will depend on temperature, soil type, rain/moisture, sunlight and amount applied.
- What weeds does Preen® Extended Control Weed Preventer kill?
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None. Preen ® Extended Control Weed Preventer helps to prevent germination of seeds from the list of weeds shown on the label for up to 6 months per application. It does not kill or inhibit existing weeds in any way.
- How much water must I apply to activate Preen® Extended Control Weed Preventer?
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After application, you only need to apply enough water to thoroughly wet the surface of the soil. The granules will not dissolve when watered in. They will disintegrate over a period of weeks.
- What are the particles on the soil surface after I watered Preen® Extended Control Weed Preventer?
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Once Preen® Extended Control Weed Preventer is watered in, the carrier, such as corn cob or biodac will remain on the surface and biodegrade within a month or so.
- How does Preen® Extended Control Weed Preventer work?
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Preen® Extended Control Weed Preventer works to create an invisible barrier that inhibits weed seed growth. The barrier can last up to 6 months.
- Will rain wash Preen® Extended Control Weed Preventer away?
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No, the active ingredient bonds to soil particles in the top layer of soil. But excessively warm wet conditions may shorten its effective period.
- Why is the Preen® Extended Control Weed Preventer container not completely full?
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Our product container is packaged/sold by weight, not by volume. If you weigh the container you will find that the weight is as stated or slightly higher.
- Do you have a guarantee on your products?
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Preen® Guarantee: To the extent consistent with applicable law, Lebanon Seaboard Corporation guarantees you will be satisfied with the performance of Preen® products when used as directed, or your money back. If not satisfied, describe the nature of your problem, and send with proof of purchase to:
Lebanon Seaboard Corporation
1600 East Cumberland St.
Lebanon, PA 17042
- How close can I apply Preen® Extended Control Weed Preventer to a non-recommended plant?
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Apply at least 12″ outside the drip-line of a non-recommended plant.
- What does “established plant” mean on the Preen® Extended Control Weed Preventer label?
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This term refers to perennials, trees and shrubs that are at least 3-inches in height, have not recently transplanted and have a strong root system. For recently transplanted plants: do not apply Preen® Extended Control Weed Preventer until plants have been watered once or twice to make sure the soil is well and uniformly settled by packing or irrigation around the plants. An established ground cover is one that is not recently planted, is well-rooted and has spread and filled in to your satisfaction. Note: Groundcovers will not spread where Preen® Extended Control Weed Preventer is active (about 4–6 months).
- What does “non-bearing" fruit and nut trees mean?
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This term refers to established fruit and nut trees that have not matured to the point of producing a harvest. Preen® Extended Control Weed Preventer can be applied around the label listed non-bearing fruit and nut trees until they begin bearing fruit or nuts; otherwise, it cannot be applied.
- When do I apply Preen® Extended Control Weed Preventer?
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A first application can be made at any time throughout the growing season -- spring, summer or fall. To establish a 12-month weed-protection cycle, reapply the product in six months.
- Is there a benefit to applying Preen® Extended Control Weed Preventer in the fall?
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September and October are perfect months for a fall application as many winter annual weeds actively germinate and grow slowly in fall and even over winter. When applied in fall, the product helps reduce these weeds in early spring and thus makes spring garden preparation easier.
- Do I have to weed first before applying Preen® Extended Control Weed Preventer?
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Yes. Preen® Extended Control Weed Preventer does not kill existing weeds. First get rid of existing weeds, roots and all, then apply Preen® Extended Control Weed Preventer. If there is no opportunity to remove weeds first, an initial application can be utilized to prevent further weeds until you have an opportunity to clear the garden and landscape beds.
- When do I reapply Preen® Extended Control Weed Preventer?
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To establish a 12-month weed-protection cycle, reapply the product six months after the prior application. Should excessively warm wet conditions shorten the effective period, it is okay to reapply 60 days or more after the prior application. Do not apply more than three times per year.
- Can Preen® Extended Control Weed Preventer be applied when plant foliage is wet?
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Yes, but only if you immediately wash off any stray granules that stick to wet leaves as wet granules can damage or discolor plant foliage. Much easier is to apply the product when leaves are dry, as then granules that land on foliage can be readily brushed off by hand.
- Does Preen® Extended Control Weed Preventer need to be watered-in?
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Yes; rain or water must immediately follow application to activate the product.
- What happens if rain or water does not immediately occur after application?
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Preen® Extended Control Weed Preventer will not start to work until activated by rain or watering. If watering is not an option, time your application to coincide with expected rain, or lightly rake the granules into the soil to protect the active ingredient from UV degradation by sunlight until rain occurs.
- How much Preen® Extended Control Weed Preventer should I apply?
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For label recommended flowers, trees, shrubs, and groundcovers, sprinkle granules lightly and evenly over the soil. Apply approximately .98 oz per each 10 square feet, or 6.125 lb per 1,000 square feet.
- Can Preen® Extended Control Weed Preventer be applied on plant foliage or exposed plant roots?
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No; plant injury could result.
- What do I do if Preen® Extended Control Weed Preventer accidentally got on plant foliage during application?
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You should immediately brush off any granules that fall on dry plant foliage. If any granules fall on wet foliage, you should thoroughly and immediately rinse them off with a garden hose.
- How do you use Preen® Extended Control Weed Preventer with flowers, trees, and shrubs?
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Remove existing weeds and weed roots. Then apply Preen® Extended Control Weed Preventer to soil or mulch around established plants and transplants. Then water in thoroughly.
- How do you use Preen® Extended Control Weed Preventer with groundcovers?
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Check that your groundcovers are listed on the product label. If they are fully established and have spread as you desire, then apply Preen® Extended Control Weed Preventer around the dry foliage and water in immediately.
- Why can't I apply Preen® Extended Control Weed Preventer to muck (constantly wet) soil or soils containing more than 10% organic matter?
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These types of soils will neutralize the active ingredients in Preen® Extended Control Weed Preventer.
- When do I apply Preen® Extended Control Weed Preventer with bulbs?
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Preen® Extended Control Weed Preventer may be applied for the control of annual weeds in ornamental bulbs, e.g., bulbous iris, daffodil (narcissus), hyacinth and tulip. Apply this product on top of the soil 2 to 4 weeks after planting but prior to the emergence of annual weeds. This product may also be applied following bulb emergence but prior to flowering and after flowering. For fall planted bulbs, apply the product in late winter or early spring to soil surface.
Do not apply to tulip plants that have emerged to a height greater than 3/4 inch. Do not apply to gladiolus prior to emergence or if corms are less than one inch in diameter. Do not apply to bulbs while they are flowering.
- Does Preen® Extended Control Weed Preventer control weeds that have been tilled under?
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No; already growing weeds that are not completely removed will emerge again. Start with a clean slate: remove existing weeds, roots and all. Then apply Preen® Extended Control Weed Preventer.
- Do I apply Preen® Extended Control Weed Preventer by hand?
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No; apply Preen® Extended Control Weed Preventer using the easy-to-use bottle with flip-top applicator-cap. Sprinkle the product granules on top of the soil or mulch at the rate recommended on the label, then water in to activate.
- Can I mix Preen® Extended Control Weed Preventer with water before application?
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No; mixing with water dilutes the active ingredients and renders the product ineffective.
- How long after an application of Preen® Extended Control Weed Preventer should I wait before planting non label-recommended plants?
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You should wait 12 months.
- Can Preen® Extended Control Weed Preventer stain?
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Yes; Preen® Extended Control Weed Preventer can stain porous surfaces such as concrete, rocks, bricks, landscape blocks, shoes, leather, linoleum, vinyl, shoes, and carpet.
- How do I prevent possible staining?
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Never apply Preen® Extended Control Weed Preventer when any surrounding porous surface is wet. Sweep off or dry brush off stray granules from any non-target surface before watering the area to activate the product. To avoid surface staining in storage, place the bottle on top of a piece of cardboard or thick newspaper, not directly on shelving or flooring such as linoleum, vinyl, tile, cement or carpet.
- How can I get rid of a Preen® Extended Control Weed Preventer stain?
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Try Goo Gone or another citrus-based cleaning product to lessen the appearance of or remove a stain. Always test a small area first to ensure the product won't cause additional staining.
For porous surfaces: Use equal parts soapy water and bleach, or a paste of baking soda and water, or ultraviolet light/sunlight, or a citrus-based cleaner, or 409 carpet foaming spray cleaner. Always follow manufacturer's directions.
For non-porous, uncoated surfaces: Use acetone or an acetone based nail polish remover.
- Can I use Preen® Extended Control Weed Preventer on my lawn or with grass seed or sod?
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No; turf injury could result. Preen® Extended Control Weed Preventer is not labeled for use on lawns.
- Can I use Preen® Extended Control Weed Preventer in or near a pond, lake, or other type of waterway?
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No; Preen® Extended Control Weed Preventer is harmful to aquatic life. Do not use if there might be any chance of runoff into the water.
- Can I use Preen® Extended Control Weed Preventer around, under, or near a swimming pool, sandbox, playground type area, or under bird feeders?
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No.
- Can I use Preen® Extended Control Weed Preventer in or near a greenhouse or any type of enclosed area?
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No; staining and/or volitization could occur causing plant injury.
- Can Preen® Extended Control Weed Preventer be used in potted plants or planter boxes?
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No; plant injury could result.
- Can I use Preen® Extended Control Weed Preventer where chickens, horses or other animals graze?
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No.
- Can I use Preen® Extended Control Weed Preventer on a garden slope or hillside?
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Yes, if a waterway is not at the bottom of the slope or hillside.
- Can I use Preen® Extended Control Weed Preventer on decorative stones or pebbles?
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Preen® Extended Control Weed Preventer can stain porous materials such as stone or brick. Before treating your entire area, do an application to a small area to test for staining, which would appear within a few days. Always apply when stones are dry and water thoroughly immediately after application.
- What plants are recommended with Preen® Extended Control Weed Preventer?
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See the long list of compatible plants on the product label. Also note on the label the list of plants around which Preen® Extended Control Weed Preventer should NOT be applied.
- Can I use Preen® Extended Control Weed Preventer with a plant that is not listed on the product label?
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If you wish to use Preen® Extended Control Weed Preventer on plant species not listed on this label, you should determine the suitability for use by treating a small number of such plants. Prior to treatment of larger areas, the treated plants should be observed for any sign of herbicidal injury for 30 to 60 days of normal growing conditions. The user assumes responsibility for any plant damage or other liability resulting from use of Preen® Extended Control Weed Preventer on plant species not listed in this label. Do not apply to any plant-intended for food or feed.
